ProComp/Speedmaster aluminum heads

j par said

And how much time grinding on those heads to get less CFM? And those have the 191 intake valves as well?

Click to expand...

1.92 valves for the record...LOL. Tell you what we can do. Get a ET slip with your clutch tamer. Bolt your heads on and see the difference. I'll do the exact same, and we'll see whose ET drops the most - mine or yours. That would be a fun thread "J pan's heads vs 318WR heads" Biggest difference wins!